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Excalibur ISX 5312/5314 T-1 Multiplexer Installation and Operation
5-48
ISX 5314
RxClk
RxClk
DTE 3
DCE
DTE 4
DTE
DTE 2
DTE
ExtClk
ExtClk
RxClk
RxClk
DTE 1
DCE
DBU Device
DCE
Customer
DTE
Customer
DTE
DBU Device
DCE
Figure 5-1. External Dial Backup Clock Source
Automatic Dial Backup Failures
If the dial backup process fails after trying to establish a connection for 60 seconds, the
ISX 5312/5314 sends a DBU Timeout alarm to the network management system. It then
waits 30 seconds and retries the backup connection. This process continues until one of
the following occurs:
•
The backup connection is established
•
The dedicated line is back in service
•
A total of five attempts are made to establish the backup connection
If a total of five retry attempts are made unsuccessfully, you must use the RTN feature to
re-enable automatic dial backup mode.
In addition to sending an alarm to the network management system, the ISX 5312/5314
also logs the alarm, and sends it to the unit front panel (if the DSU Alarm parameter is
enabled).
Содержание ISX 5312
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